色多多在线观看播放-色多多在线观看高清免费-色多多在线观看视频-色多多在线看-欧美aaaaa性bbbbb小妇-欧美aaaav免费大片

The biggest regret in life is giving up what should not be given up easily, and stubbornly persisting in what should not be persisted.

It is the tears of the earth that keep her smiles in bloom。

Education is what survives when what has been learned has been forgotten.

知識的最大敵人不是無知，而是知識的幻覺。